How do you half a recipe that calls for an odd number of eggs?

Beat one egg in a small bowl, then measure out half by volume (about 1.5 tablespoons of beaten egg). For three eggs halved, use one whole egg plus half of a second beaten egg.

Recipe Scaler: Scale Any Recipe Up or Down

Q: How do you scale a recipe up or down?

Multiply every ingredient by the same factor. To halve a recipe, multiply by 0.5. To double it, multiply by 2. When you know servings instead, divide desired servings by original servings to get your factor, then apply it to each ingredient.

Q: When does scaling a recipe break?

Baking is the riskiest. Leavening agents, pan size, and baking times do not scale in a straight line. Spices, salt, and strong flavors also scale unevenly, so season to taste. Eggs cannot be split cleanly below one, and cooking times need judgment, not multiplication.

Q: Do cooking times change when you double a recipe?

Usually, but not by doubling. A doubled casserole may need 10 to 25 percent more time, and the oven temperature usually stays the same. Start checking early and use doneness cues like internal temperature rather than the clock.

A free recipe scaling calculator. Paste your ingredient list, choose a scale factor or change the serving size, and get a scaled recipe with kitchen friendly fractions like 1/3 cup or 2 1/2 cups.

Recipe Scaler scales any recipe up or down: paste your ingredients, pick a factor like half or double, and get the new quantities in easy kitchen fractions. It handles servings math and flags ingredients that do not scale cleanly, like eggs and leavening.

Ingredients, one per line

Scale factor

Custom factor

Scaled ingredients

Enter your ingredients and tap Scale recipe.

How to scale a recipe

Paste each ingredient on its own line, quantity first, like "2 cups flour".
Pick a scale factor (half, double, triple, or a custom number) or enter original and desired servings.
The calculator multiplies every quantity by your factor and rounds to kitchen friendly fractions.
Copy the result and cook. Lines it cannot parse are passed through unchanged, so notes like "salt to taste" survive.

When scaling a recipe breaks

Multiplying ingredients is easy. Knowing when not to trust the math is the real skill.

Baking chemistry is not linear

Leavening agents like baking powder and baking soda do not double cleanly. At double, use about 1.5 times the leavening rather than twice. Yeast doughs behave similarly, and pan size matters more than the recipe admits: a doubled cake needs a bigger pan, not just more batter in the same one.

Eggs do not split neatly

Half of one egg is about 1.5 tablespoons of beaten egg. For three eggs halved, use one whole egg plus half of a second beaten egg. For very small batches, consider egg products or a different recipe rather than fighting thirds of an egg.

Spices, salt, and heat

Strong flavors scale unevenly because taste perception is not linear. When doubling, add about 1.5 times the salt, spice, and garlic, then taste and adjust. You can always add more. You cannot take it back.

Cooking times need judgment

A doubled casserole does not take twice as long. Plan on roughly 10 to 25 percent more time, keep the oven temperature the same unless the pan is much deeper, and check early. Internal temperature and visual cues beat the clock every time.

Recipe scaling tips

Weigh with a kitchen scale for big batches. Grams scale perfectly, cups do not.
Scale the recipe before you start, not while cooking. Doing math mid saute is how mistakes happen.
Keep the pan size honest. Doubling a recipe usually means a bigger pan or two pans, not a taller pile in the same one.
Write down what worked. Your halved brownie pan size is future you thanking present you.
Taste at the end, not the beginning. Seasoning adjustments are the last step, after all the scaled ingredients are in.

Recipe scaling questions

How do you scale a recipe up or down?

Multiply every ingredient by the same factor. Halve with 0.5, double with 2, triple with 3. When you know servings instead of a factor, divide desired servings by original servings and apply that number to every ingredient.

How do you half a recipe calculator style?

Halving is the most common scaling job, and it is where the awkward fractions live. A half recipe calculator turns 1/3 cup into 2 tablespoons plus 2 teaspoons, and 3/4 cup into 6 tablespoons. This tool rounds to fractions you can actually measure.

How do you double a recipe without ruining it?

Double every ingredient, but hold back on leavening, salt, and spices, adding about 1.5 times instead of twice and adjusting to taste. Use a bigger pan or two pans, and expect only a little extra cooking time, checked early.

When does scaling a recipe break?

Baking is the riskiest because leavening, pan size, and bake times do not scale in a straight line. Eggs resist clean splitting, and spices, salt, and heat scale unevenly, so season to taste. Cooking times need judgment, not multiplication.

Do cooking times change when you double a recipe?

Usually, but not by doubling. A doubled dish may need 10 to 25 percent more time at the same temperature. Start checking early and rely on doneness cues like internal temperature rather than the clock.

How to scale a recipe without breaking it

Doubling every line of a recipe works on paper, but some ingredients and steps do not follow straight multiplication. Salt, spices, garlic, and anything hot scale unevenly because your taste buds do not respond in a straight line. When doubling, add about 1.5 times the seasoning, then taste and adjust near the end. You can always add more, and you can never take it back.

Leavening is the other trap. Baking powder, baking soda, and yeast respond to the volume of the batter and the pan, not to a pure multiplier. Doubling the leavening often leaves a soapy taste or a collapsed crumb. Use roughly 1.5 times instead, and if you are scaling a baked good up by a lot, check that your pan can handle it. A deeper pan means a lower temperature and a longer bake, because the heat needs more time to reach the center.

Pan size and batch count matter as much as the ingredient math. Spreading a doubled recipe across the same pan crowds the surface, which steams instead of browning. Go bigger, use two pans, or accept a modest increase in cooking time rather than doubling it. A good rule of thumb: expect 10 to 25 percent more time and start checking early.

Know when to cook in batches instead. Whipped egg whites, risotto, seared meat, and anything that needs high dry heat all lose quality in an overcrowded pot or pan. Two proper batches beat one compromised one every time, and you can keep the first warm while the second finishes. Save the calculator math for the ingredients, and let your eyes and nose handle the finish.